可以显示多行文字的工具条

可以显示多行文字的工具条


作者：ahr

下载源代码


界面显示效果如图一：

图一 例子程序运行画面

CToolBar不支持多行文字，本文将通过一个定制的MFC/C++类 CMTToolBar 实现在工具条中显示多行文字。其思路是先把文字变成位图，再替换原来的工具条位图，达到显示多行文字的效果。这个类中最主要的一个成员函数是ShowText(UINT nIDResource)，其定义如下：

// 显示工具条文字BOOL CMTToolBar::ShowText(UINT nIDResource){// determine location of the bitmap in resource forkHINSTANCE hInst = AfxFindResourceHandle(MAKEINTRESOURCE(nIDResource), RT_TOOLBAR);HRSRC hRsrc = ::FindResource(hInst, MAKEINTRESOURCE(nIDResource), RT_TOOLBAR);if (hRsrc == NULL)return FALSE;HGLOBAL hGlobal = LoadResource(hInst, hRsrc);if (hGlobal == NULL)return FALSE;CToolBarData* pData = (CToolBarData*)LockResource(hGlobal);if (pData == NULL)return FALSE;ASSERT(pData-wVersion == 1);// 得到单个按钮的图像大小CSize sizeImage(pData-wWidth, pData-wHeight);// release the resourceUnlockResource(hGlobal);FreeResource(hGlobal);// 得到 CToolBarCtrlCToolBarCtrl& bar = GetToolBarCtrl();// 得到 ToolBarCtrl的DCCDC *pdcCtrl = bar.GetDC();CDC dcDst;// 目标DC , 用于生成新位图dcDst.CreateCompatibleDC(pdcCtrl);// 新建字体LOGFONT logFont;ZeroMemory(&logFont,sizeof(logFont));logFont.lfWidth = 6;logFont.lfHeight = 12;logFont.lfCharSet = GB2312_CHARSET;strcpy(logFont.lfFaceName, "宋体" );CFont fntNew;fntNew.CreateFontIndirect(&logFont);CFont *pfntOld = dcDst.SelectObject(&fntNew);// 新单个按钮的图片大小CSize sizeNewImage(sizeImage.cx, 0);// 创建字符串数组const int nCount = bar.GetButtonCount();CStringArray *pstrArray = new CStringArray[nCount];int nLines = 0;// 文字行数intnIndex = 0;int nCharHeight = 0;// 单个字符高度TBBUTTONtb;int nBtnCount = 0;// 按钮个数（除去分隔条）for (int i = 0; i < nCount; ++ i){ZeroMemory(&tb, sizeof(TBBUTTON));bar.GetButton(i, &tb);// 如果是分隔条if ((tb.fsStyle & TBSTYLE_SEP) ==  TBSTYLE_SEP){ continue;}CString strT;strT.LoadString(tb.idCommand);int nPos = strT.Find(_T(''n'')) + 1;while(nPos  0){int nPos2 = strT.Find(_T(''n''), nPos);int nIndex;if(nPos2nPos){nIndex = pstrArray[nBtnCount].Add( strT.Mid(nPos, nPos2-nPos) );nPos = nPos2 + 1;}else if(strT.GetLength()  nPos){nIndex = pstrArray[nBtnCount].Add( strT.Mid(nPos) );nPos = -1;}nLines = max(nLines, nIndex+1);CSize size = dcDst.GetTextExtent(pstrArray[nBtnCount][nIndex]);nCharHeight = max(size.cy, nCharHeight);sizeNewImage.cx = max(size.cx, sizeNewImage.cx);}nBtnCount ++;}// 换算成实际像素sizeNewImage.cy = nLines*nCharHeight;// 读取工具条位图资源CBitmapbmpToolBar;BITMAPbmBitmap;if (!bmpToolBar.Attach(LoadImage(AfxGetInstanceHandle(),                          MAKEINTRESOURCE(nIDResource),                          IMAGE_BITMAP, 0, 0,                          LR_DEFAULTSIZE|LR_CREATEDIBSECTION                          |LR_LOADMAP3DCOLORS )) ||                          !bmpToolBar.GetBitmap(&bmBitmap))return FALSE;// 取得位图总宽高int nWidth = bmBitmap.bmWidth;int nHeight = bmBitmap.bmHeight;// 新位图的总宽高int nWidthNew = sizeNewImage.cx * nBtnCount;sizeNewImage.cy += nHeight;int nHeightNew = sizeNewImage.cy;CDC dcSrc;// 源DCdcSrc.CreateCompatibleDC(pdcCtrl);CBitmap *pbmpOldSrc = dcSrc.SelectObject(&bmpToolBar);CBitmap bmpDst;// 新位图bmpDst.CreateCompatibleBitmap(&dcSrc, nWidthNew, nHeightNew);CBitmap *pbmpOldDst = dcDst.SelectObject(&bmpDst);// 先填充背景色dcDst.FillSolidRect(CRect(0, 0, nWidthNew, nHeightNew), ::GetSysColor(COLOR_BTNFACE));dcDst.SetBkMode(TRANSPARENT);// 设置透明背景方式int nStartX = (sizeNewImage.cx-sizeImage.cx)/2;// 计算开始横坐标